Not all functional medicine doctors are outside the insurance system. Some large clinical practices have functional medicine practitioners (typically Nurse Practitioners with more training) available by referral.

This may have been lost in my long post above, so I will repeat:
Rather than give up in despair, maybe look for a practitioner through an organization that certifies and trains professional in functional medicine? I found good information about what functional medicine is here: http://www.ifm.org

And on the same site, I searched for certified practitioners near me:
http://www.ifm.org/find-a-practitioner/
Then, if you identify a doctor or nurse practitioner near you, check out the doc.

And I will repeat what we often tell people here: Never seek medical care from an Ad (on Google you can identify these by the tiny word "Ad" in the top line) - look for professional organizations, certifying agencies, etc. for advice. Exercise your right to be a smart consumer.
Sue

Sue